It's good to know that if you find out that you don't like the placement of your perennial, you can transplant it pretty much any time of the year. I didn't know that. I was told spring was best when the plant is young. I guess you move less dirt moving your plants around in the spring, but I must say it's good to know that you can do it anytime! Just be sure to use plenty of water before, and after you transplant.